The Dish box has to send commands back to the antenna; at least the Dish Trailblazer antenna. The built-in amplifier will block this. Somewhere on this forum I have seen a mod to the built-in amplifier to allow the signal to be sent.
Since I mainly only watch the TV in the living area, I just keep the Dish amp in the cabinet and run the cable from the Dish antenna through the kitchen window.
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